Protective mask



FIG. 1 is a perspective view of a first embodiment of a protective mask, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of a second embodiment of a protective mask, showing our new design;

FIG. 9 is a front elevational view thereof;

FIG. 10 is a rear elevational view thereof;

FIG. 11 is a left side elevational view thereof;

FIG. 12 is a right side elevational view thereof;

FIG. 13 is a top plan view thereof; and,

FIG. 14 is a bottom plan view thereof.

The broken lines illustrate environmental features that form no part of the claimed design. 

CLAIM The ornamental design for a protective mask, as shown and described. 